Red Sox put RHP Masterson on DL, recall LHP Ross

Boston Red Sox pitcher Justin Masterson, left, walks back to the mound after giving up a home run to Oakland Athletics' Josh Reddick, running the bases, right, in the third inning of a baseball game Tuesday, May 12, 2015, in Oakland, Calif. (AP Photo/Ben

The Red Sox said Thursday that the struggling Masterson has right shoulder tendinitis. In seven appearances this season, he is 2-2 with a 6.37 ERA. On Tuesday night, he gave up six runs on six hits in 2 1-3 innings in a 9-2 loss to the Oakland Athletics.

In the offseason, Boston signed Masterson as a free agent from the St. Louis Cardinals.

Ross began the season with Boston and was 0-0 with a 6.17 ERA in 13 outings before being optioned to Triple-A Pawtucket last Sunday.

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